Could not load 'markdown.styles': *.css

[sakronos]

• VSCode Version:Code 1.33.0 (0dd516d, 2019-04-04T15:11:32.076Z)
• OS Version:Windows 10 1809 x64

settings.json is as follows

{
    "workbench.colorTheme": "Markdown Editor Yellow",
    "editor.fontFamily": " PingFang SC, ‘Hiragino Sans GB’, Helvetica ",
    "editor.fontSize": 16,
    "markdown.styles": [
        "md.css"
    ],
}

Steps to Reproduce:

1.Open a markdown file, and click open Preview to the Side
2.visual studio code NOTIFICATIONS show the warning: Could not load 'markdown.styles': md.css

In the previous version, it works properly.

[mjbvz]

Duplicate of #71802